Cavum Septum Pellucidum

Timothy C. Hain, MD.• Page last modified: March 20, 2021

csp axial csp coronal
Axial view Coronal View

Overview of cavum septum pellucidum (CSP)

CSP is a normal anatomical variant which is usually asymptomatic. It is present in all premature infants, and only 12-15% of six month olds. Incidental (asymptomatic) cava are seen in about 1% of cranial CT scans. (Bogdanoff and Natter, 1989).

The septum pellucidum extends between the anterior portion of the corpus callosum and the body of the fornix. Many symptoms and disease have been attributed to cysts of the septum pellucidum (as shown above), but CSP is such a common finding that these associations are questioned. Examples of supposed consequences are mental disturbances, ataxia, disordered speech, epilepsy, and bilateral Babinski signs.(Wilder, 1938)

Some cases have been reported with postural symptoms, including dizziness on lying supine or loss of consciousness when bending forward (Silbert et al, 1993).

Cysts can be treated by surgery including sterotactic puncture, fenestration, and shunting. (Silbert et al, 1993)

Lipoma of corpus callosum

Lipoma of corpus callosum. This is the arc seen on the MRI above.

A disorder involving another corpus callosum abnormality is the lipoma of the corpus callosum. This is a congenital anomaly, largely documented with numerous case reports (e.g. Piovesan et al, 2000) . It is of some importance only because it is sometimes associated with other congenital anomalies.